October 14, 2005

polymer powders for building
adhesive compositions
Patent No. U.S. 6,890,975 B2
Wacker Polymer Systems GmbH & Co. KG has received a patent for a hydraulically settable inorganic binder-based construction adhesive which is cementitious, or cement-free and within which an aqueous polymer dispersion or redispersible polymer powder is added. The improvement is comprised of adding a portion of the aqueous polymer dispersion or redispersible polymer powder, a polymer prepared by emulsion polymerization in the presence of a protective colloid. The polymer prepared from mon­omers is comprised of at least one vinyl ester monomer and from 0.2-1.5% weight, based on the total weight of all monomers, of an auxiliary monomer having a water solubility higher than vinyl acetate, wherein the cementitious construction adhesives comprises from 5-80% weight cement, from 5-80% weight percent of filler, and from 0.5-60% weight protective colloid stabilized